基于频域迭代判决反馈均衡的低复杂度FTN接收机

doi:10.11959/j.issn.1000-436x.2017052

通信学报 ›› 2017, Vol. 38 ›› Issue (4): 190-198.doi: 10.11959/j.issn.1000-436x.2017052

• 学术通信 • 上一篇

基于频域迭代判决反馈均衡的低复杂度FTN接收机

曾娟^1,²,王颖¹,李晓娜¹,王中方¹,汪永明^1,²

¹ 中国科学院信息工程研究所，北京 100093
² 中国科学院大学，北京 100049

修回日期:2016-12-21 出版日期:2017-04-01 发布日期:2017-07-20
作者简介:曾娟（1991-），女，湖北广水人，中国科学院信息工程研究所硕士生，主要研究方向为通信与信息系统。|王颖（1987-），女，河南信阳人，博士，中国科学院信息工程研究所助理研究员，主要研究方向为5G新型编码调制、无线物理层安全。|李晓娜（1986-），女，辽宁沈阳人，中国科学院信息工程研究所工程师，主要研究方向为移动通信、信息安全。|王中方（1987-），男，河南南阳人，中国科学院信息工程研究所工程师，主要研究方向为移动通信系统物理层安全。|汪永明（1968-），男，湖北广水人，博士，中国科学院信息工程研究所高级工程师、博士生导师，主要研究方向为通信系统与安全。
基金资助:
国家自然科学基金资助项目(61501459)

Low-complexity FTN receivers based on frequency domain iterative decision feedback equalization

Juan ZENG^1,²,Ying WANG¹,Xiao-na LI¹,Zhong-fang WANG¹,Yong-ming WANG^1,²

¹ Institute of Information Engineering,Chinese Academy of Sciences,Beijing 100093,China
² University of Chinese Academy of Sciences,Beijing 100049,China

Revised:2016-12-21 Online:2017-04-01 Published:2017-07-20
Supported by:
The National Natural Science Foundation of China(61501459)

摘要/Abstract

摘要：

超Nyquist（FTN,faster-than-Nyquist）信号传输能在不降低系统可靠性的情况下，提高系统的有效性，但其引入了严重的码间串扰，导致最佳接收的复杂度非常高。迭代块判决反馈均衡器（IBDFE,iterative block decision feedback equalizer）能以较低的复杂度达到与最佳接收相近的性能，有效降低了FTN接收机的复杂度，但其复杂度仍能进一步降低。因此，在IBDFE的基础上，简化了前馈和反馈滤波器的设计，为FTN通信系统提出了一种降低复杂度的IBDFE（RC-IBDFE,reduced-complexity IBDFE）。当加速因子为τ={0.8,0.7}时，数值结果和分析表明，与IBDFE相比，RC-IBDFE的顽健性更好，复杂度降低了{45.7%,25%}，当误比特率为10^-5时的性能增益为{0.605 4,0.193 6} dB；与已有的低复杂度IBDFE（LC-IBDFE,low-complexity IBDFE）相比，RC-IBDFE的顽健性更好，复杂度降低了{13.6%,-25.8%}，当误比特率为10^-5时的性能增益为{0.289 7,0.531 2} dB。

关键词: FTN信号传输, 码间串扰, 迭代块判决反馈均衡器, 复杂度

Abstract:

Faster-than-Nyquist (FTN) signaling can improve the system effectiveness without reducing the system reliability,but the fierce inter-symbol interference (ISI) introduced by it may cause that the complexity of the optimal receiver is intolerable.An effective low-complexity FTN receiver is iterative block decision feedback equalizer (IBDFE),which can achieve performance close to the optimal receiver with much lower complexity,but its complexity can be further reduced.Therefore,a reduced-complexity IBDFE (RC-IBDFE) was proposed for FTN communication systems,which was based on IBDFE,but introduced a simplified method to design the feedforward and feedback filters.When packing factor is τ={0.8,0.7},numerical results and analysis indicate that,compared with IBDFE,RC-IBDFE has stronger robustness,its complexity is reduced by {45.7%,25%},and its performance gain is {0.605 4,0.193 6} dB when the bit error rate (BER) is 10^-5.Compared with the existing low-complexity IBDFE (LC-IBDFE),RC-IBDFE has stronger robustness,its complexity is reduced by {13.6%,-25.8%},and its performance gain is {0.289 7,0.531 2} dB when the BER is 10^-5.

Key words: FTN signaling, inter-symbol interference, iterative block decision feedback equalizer, complexity

中图分类号:

TN911.23

曾娟,王颖,李晓娜,王中方,汪永明. 基于频域迭代判决反馈均衡的低复杂度FTN接收机[J]. 通信学报, 2017, 38(4): 190-198.

Juan ZENG,Ying WANG,Xiao-na LI,Zhong-fang WANG,Yong-ming WANG. Low-complexity FTN receivers based on frequency domain iterative decision feedback equalization[J]. Journal on Communications, 2017, 38(4): 190-198.

图/表 12

图1

图2

图3

表1

图4

图5

表2

信号处理所需的复乘次数"

接收机	所需的复乘次数
IBDFE	N_IL_blbL_b
LC-IBDFE	N_IL_blbL_b-N_IL_b+L_b
RC-IBDFE	$N_{I} L_{b} lb L_{b} - \frac{L_{b}}{2 lb L_{b}} - N_{I} L_{b} + 2 L_{b}$

表2

表3

图6

表4

图7

表5

参考文献 14

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[11]	SEN P , AKTAS T , YILMAZ A O . A low-complexity graph-based LMMSE receiver designed for colored noise induced by FTN- signaling[C]// Wireless Communications and Networking Conference (WCNC). Istanbul,Turkey, 2014: 642-647.
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参数	参数取值
调制方式	8PSK
信道h(t)	AWGN信道
{s_n}数据块总数	10 000
{s_n}数据块长度L_b	L _b=1 024
{q_n}长度L_q	τ=0.8时,L_q=13;τ=0.7时,L_q=15
ISI长度L_ISI	τ=0.8时,L_ISI=12;τ=0.7时,L_ISI=14
PN序列长度L_PN	τ=0.8时,L_PN=12;τ=0.7时,L_PN=14
{d_n}数据块长度L_d	τ=0.8时,L_d=1012;τ=0.7时,L_d=1010
脉冲成型滤波器 f(t)	根升余弦（滚降因子0.5、截断长度5T）

接收机	信号处理、滤波器设计所需的总的复乘数		相对IBDFE降低的复杂度
接收机	τ=0.8	τ=0.7	τ=0.8	τ=0.7
IBDFE	35 840	53 248	-	-
LC-IBDFE	22 528	31 744	37.1%	40.4%
RC-IBDFE	19 456	39 936	45.7%	25%

差异类型	差异值/dB
差异类型	τ=0.8	τ=0.7
IBDFE-LC-IBDFE	0.315 7	-0.337 6
IBDFE-RC-IBDFE	0.605 4	0.193 6
LC-IBDFE-RC-IBDFE	0.289 7	0.531 2

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基于频域迭代判决反馈均衡的低复杂度FTN接收机

Low-complexity FTN receivers based on frequency domain iterative decision feedback equalization

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